I bought a patagonia shorty, very light, dries fast, definitely a different neoprene. As for drysuits, I used to own the OR befor they went crazy with the useless extra fabric to make it look like a snowboard suite...on top of it, it loses its water proof and OR recomends using nikwax or something on them... As for breathability, if you dońt have a humidity differential between the inside and the outside, it won't work. If the outer fabric of your dry is saturated with water...it won't, if you swim in the water...it won't. So like wit the Gul, kokatat, OR, or neoprene drys like the ion, you will get damp no matter what. So this time I bought a mystic vulcanic and even if damp, you stay toasty, they float better than the baggy ones. Then i just drive with ski base layer under my jeans and regular clothes jump in my dry without freezing and after my session, i put my jeans back and am ready to hit the pub for hot soup... The OR crowd are all in fleece sweat pants or even better...in standby mode wearing their drysuit... At least they can void all the beer using the p-zip. So far, for me, "baggy" drysuits are the best for my needs. I might go back to GUL at some point as it was by far the baggy dry i prefered (front zip, breathable(usefull on the beach, not in the water), etc.
My 2 cents